package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;

    /**
     * 根据微信授权码实现微信登录
     * @param userLoginDTO
     * @return
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //授权码
         String code = userLoginDTO.getCode();
         String openid = getOpenid(code);
         //判断openid是否为空，如果为空表示登陆失败，抛出异常
         if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
         }
         //根据openid查询用户信息
         User user = userMapper.getByOpenid(openid);
         if(user == null){
             //当前是一个新用户，自动完成注册
             user = new User();
             user.setOpenid(openid);
             user.setCreateTime(LocalDateTime.now());
             userMapper.insert(user);
         }
         //返回用户对象
         return user;
    }


    /**
     * 获取微信用户的openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
         //请求参数封装
         Map map = new HashMap();
         map.put("appid",weChatProperties.getAppid());
         map.put("secret",weChatProperties.getSecret());
         map.put("js_code",code);
         map.put("grant_type","authorization_code");
         //调用工具类，向微信接口服务发送请求
         String json = HttpClientUtil.doGet(WX_LOGIN, map);
         log.info("微信登录返回结果：{}", json);
         //解析json字符串
         JSONObject jsonObject = JSON.parseObject(json);
         String openid = jsonObject.getString("openid");
         log.info("微信用户的openid为：{}", openid);
         return openid;
    }
}

